Step 1
In a small bowl, whisk together the steak sauce, soy sauce, rice wine vinegar, and brown sugar until smooth. Heat the sesame oil in a wok or large skillet over high heat. Add the onion and ginger, cooking them over medium-high heat until the onion starts to turn golden, about 2 to 3 minutes. Toss in the steak, broccoli, mushrooms, and garlic, and stir everything occasionally as it cooks. Keep going until the steak is cooked through and the veggies have softened, which should take around 8 minutes. Finally, pour the sauce over the beef and vegetables, stirring well to coat everything evenly. Let it cook for another couple of minutes so the flavors can meld together nicely.



